It's a reference to a video game called Team Fortress 2 that has been continuously popular for the last 15 years.
Im assuming you don't know but if you do I'm sorry for bothering you.
While the game is fun and free, I would not recommend playing it on account of it's massive hacker/bot issue and because half of the community is extremely racist and the other half is progressive which leads to a bunch of fights and people kicking each other from the game.
I was got kicked from the game because I called a guy with a nazi flag pfp (who was praising Hitler), a bigot. Apparently I need yo learn to "take a joke" (they had also kicked a Trans person from the games moments prior)
The game and it's characters are great, sadly the bad parts of the community and the hackers make the game hell.
There are 9 characters (+a sandwich) that got 'trailers' called 'meet the ____'.
This is a gift for my friend Mal! if you can, please go check her out on AO3 as Malcoholic, she has some really good SirDust and RadioHusk fics. You do need an acct to view her stuff though
I think I have a new 3rd favorite ship. Sirdust going in third, so far it goes in order: Charlie x Vaggie, HuskerDust, SirDust, Raidiodust, and in faith Chalistor.
STOP WATCHING SNAKE AND SPIDER CUDDLE TEAM THEIRS A RED SPY IN THE BASE!